are working around the clock to try to determine who sent ricin-laced letters to president obama and other officials just one day after charges were dropped against the suspect that was in custody. the former suspect, paul curtis, spoke exclusively with our chris cuomo just a little while ago. >> is there any connection between you and what was done with these ricin letters? any at all? >> none whatsoever, sir. >> in your understanding, christie mccoy, are investigators completely free of your client as someone who's implicated in this situation? because they have not given clear word. what is your understanding? >> that is absolutely my understanding, chris. we are, in fact, i spoke with someone this morning involved in the investigation with the prosecutors, and i actually had made arrangements, i haven't had a chance to speak with kevin about it yet, that we're actually ready to assist them in as far as what we know, what kevin knows, if there's anything that absolutely, even though they may not have publicly said that, i think that they realize what we have known all along, is th